chore: Move to Typescript (#2783)

This PR moves the entire project to Typescript. Due to the ~1000 ignores this will lead to a messy codebase for a while, but the churn is worth it – all of those ignore comments are places that were never type-safe previously.

closes #1282

app/components/ConnectionStatus.tsx

@@ -0,0 +1,58 @@
+import { observer } from "mobx-react";
+import { DisconnectedIcon } from "outline-icons";
+import * as React from "react";
+import { useTranslation } from "react-i18next";
+import styled, { useTheme } from "styled-components";
+import breakpoint from "styled-components-breakpoint";
+import Fade from "~/components/Fade";
+import NudeButton from "~/components/NudeButton";
+import Tooltip from "~/components/Tooltip";
+import useStores from "~/hooks/useStores";
+
+function ConnectionStatus() {
+  const { ui } = useStores();
+  const theme = useTheme();
+  const { t } = useTranslation();
+
+  return ui.multiplayerStatus === "connecting" ||
+    ui.multiplayerStatus === "disconnected" ? (
+    <Tooltip
+      tooltip={
+        <Centered>
+          <strong>{t("Server connection lost")}</strong>
+          <br />
+          {t("Edits you make will sync once you’re online")}
+        </Centered>
+      }
+      placement="bottom"
+    >
+      <Button>
+        <Fade>
+          <DisconnectedIcon color={theme.sidebarText} />
+        </Fade>
+      </Button>
+    </Tooltip>
+  ) : null;
+}
+
+const Button = styled(NudeButton)`
+  display: none;
+  position: fixed;
+  bottom: 0;
+  right: 32px;
+  margin: 24px;
+
+  ${breakpoint("tablet")`
+    display: block;
+  `};
+
+  @media print {
+    display: none;
+  }
+`;
+
+const Centered = styled.div`
+  text-align: center;
+`;
+
+export default observer(ConnectionStatus);